class A(object):
    count = 0
    def __init__(self):
        self.name = '孙悟空'
    def test(self):
        print('这是test方法~~~~')
    @classmethod
    def test_2(cls):
        print('这是test_2方法,它也是一个类方法~~~~',cls)
    @staticmethod
    def test_3():
        print('tetxt_3执行了~~~')
a = A() 
A.test_3()
a.test_3()